In exchange for dual wielding? I think its fair... It could do the normal amount of damage that your melee does when the ability is depleted... What are you even talking about?

For high level content, a melee is pointless with no ability. For dual wielding pistols you could add a pistol whip animation, but what if there are weapons in the future like SMGs? The reason I bring this up is because of how Bungie handled this in Halo. You would literally drop your right weapon in favor of a melee attack.

I'm just talking about a specific gun. An exotic. And if melee abilities were really so crucial to success they would have used an unused button for the ability and another for a regular melee. Plus I'm thinking a more PvP oriented gun anyway